Handling a NSURLRequest with timeout when using delegate

问题

I'm using a NSMutableURLRequest to connect to a web site to get a JSON response. I'm doing so by generating the request, and then using NSURLConnection with a delegate of self to handle the async connection. I've implemented all the normal delegate methods:

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
- (void)connectionDidFinishLoading:(NSURLConnection *)connection

All works perfectly with getting data back, dealing with any errors that occur, etc. However with the timeout on the NSURLRequest set to 10 seconds I don't seem to get called in those methods (I expected the didFailWithError to get called). It just sits there forever and I have no notification that it timed out.

Reading the iPhone API docs I don't see any mention of what should happen when the timeout occurs, just that you can set the timeout value. What should happen? I didn't see any other delegate methods in the API that would help. I don't have to manually check for timeouts, do I? Are timeouts only for synchronous requests?

回答1:

Your timeout is received in this method:

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

回答2:

u will br receiving such type of iofo:

in did fail with

error: Error Domain=NSURLErrorDomain Code=-1001 UserInfo=0xed4870 "timed out"

回答3:

The timeout behaviour is a bit quirky, see this thread on Apple’s developer forums.

回答4:

What I did was this:

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    if (error.code == -1001){
        [self showTimeoutAlert];//My method to show dialog with timeout message.
    } else {
        [self showInvalidURLAlert];//My method to show dialog with bad URL message.
    }
}

As said before -1001 is for timeout, in other tests I got -1003 (for bad URL or no connection avaliable).

I was aiming to treat timeout so anything else I treated as bad URL.

回答5:

Put some log statements in each method and check what they give. Whenever it times out, you definitely get a notification on the console about the timeout. I am getting that notification . Check your code and if you are still have problems, let us know.

来源：https://stackoverflow.com/questions/1252669/handling-a-nsurlrequest-with-timeout-when-using-delegate

标签

iphone

timeout

nsurlconnection

nsurlrequest